Laser Doppler Velocimeter Measurements in High Speed Flows.
Final rept. 26 Aug 71-30 Jun 74,
PURDUE UNIV LAFAYETTE IND SCHOOL OF MECHANICAL ENGINEERING
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A three year research program covering the development and use of a Laser Doppler Velocimeter LDV for high speed flow measurements is described. The current configurations of the LDV optics and the high frequency signal processors are discussed. LDV measurements made in two-dimensional transonic nozzles and in the turbulent wake of an axisymmetric supersonic nozzle are presented. These are compared with previous experimental and analytical results. Excellent agreement is found to exist. Measurement problems presented by flows of extremely high turbulence intensity are illustrated and means for resolving them are discussed.
- Fluid Mechanics